One punch changed everything for Amir Khan. Danny Garcia’s left hook swung in
from long distance and found Khan directly in its path, knocking him on his
back and ending his hopes of facing Floyd Mayweather Jr, ending his hopes of
being a unified world light-welterweight champion again and showing every
future opponent the blueprint for beating him.

Garcia had Khan on the canvas three times before Kenny Bayless, the referee,
waved the bout off at 2min 28sec of the fourth round. But he had never
recovered from that first hammering hook, landed with 30 seconds left in the
third